CN205066240U - Heat pump idle call microchannel heat exchanger - Google Patents

Abstract

The utility model discloses a micro-channel heat exchanger for a heat pump air conditioner, which comprises a vertically arranged hollow first collecting pipe and a second collecting pipe, and is horizontally spaced between the first collecting pipe and the second collecting pipe. A number of flat tubes connected between the first header and the second header, and arranged at both ends of the first header and the second header and connecting the first header and the second header The sealed end cover, the upper end of the first collecting pipe is connected with the inlet pipe, the lower end of the first collecting pipe is connected with the outlet pipe, and also includes a number of parallel spaced fins, each fin is arranged perpendicular to the flat tube, and each fin includes Several heat dissipation units, the microchannel heat exchanger for heat pump air conditioner has small air resistance, and can smoothly remove the condensed dew formed on the surface of the heat exchanger, improving heat exchange efficiency, and the product structure of the heat exchanger is reasonable and easy to process feasible.

Description

Microchannel heat exchanger for heat pump air conditioner

Technical field:

The utility model relates to a microchannel heat exchanger, in particular to a microchannel heat exchanger for a heat pump air conditioner.

Background technique:

The heat pump air conditioning system consists of a compressor, a condenser, an evaporator, a throttling device, and a four-way valve. The condenser and the evaporator are the heat exchange components of the heat pump air conditioning system, collectively referred to as heat exchangers. With the continuous development of technology, the application of parallel flow heat exchangers has been widely used in cooling-only air conditioners. Parallel flow heat exchangers generally use aluminum as the main body, including a header, an inlet pipe and an outlet pipe arranged on the header, a number of flat tubes connected to the header and the inner cavity of the header and The cooling fins are arranged between adjacent flat tubes, the flat tubes are arranged parallel to each other and spaced apart.

In the existing parallel flow heat exchanger, horizontally arranged flat tube grooves are formed on the header so that the flat tubes are parallel and arranged between the headers, and the flat tube grooves are perpendicular to the center line of the header, so there is a It cannot be ruled out that the dew on the surface of the flat tubes due to the temperature difference will reduce the efficiency of the heat exchanger. In addition, when the dew gathers together, it will form water droplets in the middle of the heat sink, which will further increase the frosting area, resulting in a sharp drop in heat transfer.

In a heat pump air conditioning system, the same heat exchanger is used as both a condenser and an evaporator. For example, in winter heating conditions, due to the temperature difference between the external environment and the cooling medium flowing through the flat tube, a dew liquid film will be formed on the surface of the flat tube, so that water droplets will also form in the middle of the heat sink. If the dew is not discharged from the surface of the flat tube and heat sink in time, and the ambient temperature is very low, frosting will occur on the surface of the flat tube in a short period of time, and the increase of the frosting area will reduce the overall performance of the heat exchanger. heat transfer efficiency.

At present, the heat pump air conditioner has an intelligent defrosting function. During the defrosting cycle, due to the structural design defect of the previous parallel flow heat exchanger, the dew on the surface of the flat tube cannot be eliminated. After many tests and observations, the first defrosting stage was completed Returning to the normal heating condition, the frosting phenomenon on the surface of the flat tube will be regenerated in less than 5 minutes. This phenomenon will not only affect the product function but also cause problems in product quality.

Utility model content:

The technical problem to be solved by the utility model is to provide a microchannel heat exchanger for heat pump air conditioners that can improve heat exchange efficiency. The microchannel heat exchanger for heat pump air conditioners has small air resistance and can The formed condensed dew is successfully removed, and the product structure of the heat exchanger is reasonable, and the processing is simple and feasible.

The technical solution of the utility model is to provide a micro-channel heat exchanger for heat pump air conditioners, which includes a vertically arranged hollow first header and a second header, and is horizontally spaced between the first header and the second header. Several flat tubes between the second headers and communicated with the first headers and the second headers, as well as being arranged at both ends of the first headers and the second headers and connecting the first headers, the second headers, The end cap sealed by the second collecting pipe, the upper end of the first collecting pipe is connected with the inlet pipe, the lower end of the first collecting pipe is connected with the outlet pipe, and also includes a plurality of parallel spaced fins, each fin is arranged perpendicular to the flat pipe, Each fin includes a number of heat dissipation units, each heat dissipation unit end is extended with a deflector, the deflectors of each heat dissipation unit are connected to each other, and a flat tube groove is also provided between the front ends of two adjacent heat dissipation units, each flat The tubes are correspondingly inserted into the flat tube grooves of the fins, the flat tubes are provided with micro-channels for the refrigerant to flow, and the insides of the first header and the second header are provided with flow dividers for blocking the refrigerant.

After adopting the above structure, compared with the prior art, the utility model has the following advantages: the wind resistance of the microchannel heat exchanger for heat pump air conditioner is small, and the fins of this structure can make the condensed dew formed on the surface of the heat exchanger Successfully eliminated, the product structure of the heat exchanger is reasonable, and the processing is simple and feasible.

Preferably, each cooling unit is provided with a louver structure.

Preferably, a through hole is also provided on the diverting spacer for diverting the refrigerant.

Preferably, the first header, the second header, the flat tubes, and the fins are all made of aluminum or aluminum alloy materials.

Further, the free end of the deflector is also provided with drainage grooves or drainage holes.

Description of drawings:

Fig. 1 is the structural representation of the utility model.

Figure 2 is a schematic structural view of flat tubes and fins.

detailed description:

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described:

As shown in Figures 1 and 2, a microchannel heat exchanger for heat pump air conditioners includes a vertically arranged hollow first header and a second header, and is horizontally spaced between the first header and the second header. Some flat tubes 3 between the two headers and communicated with the first header and the second header, and are arranged at both ends of the first header and the second header and connect the first header, the second header, The end cover 11 sealed by the second collecting pipe, the upper end of the first collecting pipe is connected with the inlet pipe 6, the lower end of the first collecting pipe is connected with the outlet pipe 9, and also includes several fins 4 spaced in parallel, and each fin 4 is vertical Arranged on the flat tube 3, each fin 4 includes a number of heat dissipation units 42, each end of the heat dissipation unit 42 is extended with a deflector 41, in order to enhance the effect of deflecting condensed water, the free end of the deflector 41 is also provided with Drainage grooves or drainage holes, the deflectors of each heat dissipation unit are connected to each other, flat pipe grooves are also provided between the front ends of two adjacent heat dissipation units, and each flat pipe 3 is correspondingly inserted in the flat pipe grooves of the fins. That is to say, when the flat tubes are inserted into the flat tube grooves of the fins, the deflectors of the fins protrude from the flat tubes, thereby solving the original technical problem that it is difficult to discharge the condensed dew after the fins are connected to the flat tubes. The flat tubes are provided with micro-channels for the flow of the refrigerant, and the inside of the first header and the second header are provided with a flow divider 8 for blocking the refrigerant. In this embodiment, a flow divider is provided in the second header. The spacer divides the second header into two parts, namely the first flow part 1 located at the upper part of the second header and the second flow part 2 located at the lower part of the second header. There are two shunt spacers 8, which divide the first header into an upper flow part 5, a middle flow part 7 and a lower flow part 10, the upper flow part 5 is connected to the inlet pipe 6, and the lower flow part 10 is connected to the outlet pipe 9 . In addition, the first header, the second header, the flat tube 3 and the fins 4 are all made of aluminum or aluminum alloy. In order to improve the heat dissipation effect, each heat dissipation unit 42 is provided with a louver structure. At the same time, in order to better allow the refrigerant to flow in the header and the flat tube, a through hole is also provided on the divider spacer 8 to divert the refrigerant, that is, the flow of the refrigerant is adjusted through the through hole on the divider spacer. Part of the refrigerant enters the flat tube, and the other part of the refrigerant directly enters the next flow part of the header through the dividing spacer.

In this embodiment, the width of the flat tubes 3 of the microchannel heat exchanger is 20 mm, the tube spacing is 8.4 ± 1 mm, and the outer diameters of the first header and the second header are The wall thickness is 1.5±0.2mm, the fin width is 28±1mm, and the spacing is 1.18mm.

In the heat pump air-conditioning microchannel heat exchanger with this structure in the utility model, when the heat exchanger is used as an evaporator, the refrigerant flowing into the upper circulation part of the first header after flowing through the inlet pipe, due to the second Part of the refrigerant flows into a set of flat tubes connected to the second header, and then flows through a set of flat tubes and then enters the middle circulation part of the first header. It is blocked by the upper and lower divider partitions inside the first header, and then enters the second flow part of the second header through the flat tubes again, repeating this process, while the fins connected between the flat tubes strengthen The heat exchange between the refrigerant and the air is carried out, and then the flow of the above-mentioned process cycle and heat exchange are carried out in turn, and the refrigerant is discharged from the outlet pipe at the lower part of the first header. When the heat exchanger is used as a condenser, the flow direction of the refrigerant in the heat exchanger is opposite to that of the evaporator.

Therefore, the condensed water produced on the surface of the flat tube and the fins of the heat exchanger of the utility model structure can be smoothly discharged along the part of the heat dissipation fin that is wider than the flat tube, that is, the deflector plate. Even if the heat is exchanged for a long time, due to The liquid film can be continuously removed, and the reasonable setting of the refrigerant circulation channel can improve the efficiency of the heat exchanger and prevent corrosion at the same time.

The above is only a description of the preferred embodiments of the present utility model, but should not be construed as a limitation on the claims. Any equivalent structure or equivalent process transformation made by using the description and drawings of the utility model is included in the patent protection scope of the utility model.

Claims (5)

1. A microchannel heat exchanger for heat pump air conditioners, comprising a vertically arranged hollow first header and a second header, horizontal intervals are arranged between the first header and the second header and A number of flat tubes communicating with the first header and the second header, and the ends arranged at both ends of the first header and the second header and sealing the first header and the second header Cover, the upper end of the first collecting pipe is connected with the inlet pipe, and the lower end of the first collecting pipe is connected with the outlet pipe. It includes several heat dissipation units, each heat dissipation unit end is extended with a deflector, the deflectors of each heat dissipation unit are connected to each other, and there are flat tube grooves between the front ends of two adjacent heat dissipation units, and each flat tube is inserted correspondingly In the flat tube grooves of the fins, the flat tubes are provided with micro-channels for refrigerant flow, and the insides of the first collecting tube and the second collecting tube are provided with flow-distributing spacers for blocking the refrigerant. 2 . The microchannel heat exchanger for heat pump air conditioners according to claim 1 , wherein a louver structure is provided on each cooling unit. 3 . 3 . The microchannel heat exchanger for heat pump air conditioners according to claim 1 , wherein a through hole is provided on the flow dividing spacer to divide the flow of the refrigerant. 4 . 4. A microchannel heat exchanger for heat pump air conditioners according to claim 1, characterized in that: the first header, the second header, flat tubes, and fins are all made of aluminum or aluminum alloy materials become. 5 . The microchannel heat exchanger for heat pump air conditioners according to claim 1 , wherein the free end of the deflector is further provided with drainage grooves or drainage holes. 5 .